Django、nginx和uWSGI在uWSGI/MySQL重启之前缓存结果

Question

我用Django编写了一个服务器应用程序，并使用Tastypie向移动应用程序提供API，使用本地MySQL服务器来提供数据库。

似乎查询结果会在进程被关闭或结束之前一直被缓存。如果我在后端创建新用户，则只有在重新启动uWSGI或MySQL，或从不同的浏览器登录到后端时，该用户才会首次出现在列表中。

Mysql进程列表

41  example localhost:58747   example        13  Sleep                                                                                                                     
42  example localhost:58748   example        16  Sleep

如果我杀死处于“Sleep”状态的进程，它也将触发数据的刷新。

uWSGI配置

[uwsgi]
vhost = true
plugins = python
socket = /tmp/example.com.sock
master = true
enable-threads = true
processes = 2
wsgi-file = /var/sites/example-server/example/example/wsgi.py
virtualenv = /var/sites/example-server/PYTHON_ENV
chdir = /var/sites/example-server/example
touch-reload = /var/sites/example-server/example/reload

nginx配置

server {
    client_max_body_size 20M;
    listen  80;
    server_name example.com;
    access_log /var/log/nginx/example.com_access.log;
    error_log /var/log/nginx/example.com_error.log;

    location / {
        uwsgi_pass  unix:///tmp/example.com.sock;
        include     uwsgi_params;
    }

    location /media/  {
        alias /var/sites/example-server/example/example/media/;
    }

    location  /static/ {
        alias  /var/sites/example-server/example/example/static/;
    }
}

my.cnf

[client]
port            = 3306
socket          = /var/run/mysqld/mysqld.sock

[mysqld_safe]
socket          = /var/run/mysqld/mysqld.sock
nice            = 0

[mysqld]
user            = mysql
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
port            = 3306
basedir         = /usr
datadir         = /var/lib/mysql
tmpdir          = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
bind-address            = 127.0.0.1
key_buffer              = 16M
max_allowed_packet      = 16M
thread_stack            = 192K
thread_cache_size       = 8
myisam-recover         = BACKUP
query_cache_limit       = 1M
query_cache_size        = 16M
log_error = /var/log/mysql/error.log
expire_logs_days        = 10
max_binlog_size         = 100M
mysqldump]
quick
quote-names
max_allowed_packet      = 16M

[mysql]

[isamchk]
key_buffer              = 16M

transaction-isolation = READ-COMMITTED
!includedir /etc/mysql/conf.d/

我该怎么做才能解决这个问题？

谢谢 Morten

- mbogh

Answer 1

我遇到了相同的问题，发现了这篇文章 https://plus.google.com/u/0/101898908470597791359/posts/AuMJdgEo93k 在Django的settings.py文件中添加以下代码（只需添加OPTIONS键）：

DATABASES = {
   'default': {    
       'OPTIONS': { "init_command": "SET storage_engine=INNODB, SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED", }
    }
}

似乎已经解决了问题。

- LGama